本文对二维摆动磁场自由电子激光的自发辐射频谱进行了理论分析，并对分析结果进行了数值计算。
The angular spectrum of spontaneous emission in a wo-dimensional undulator free-electron laser is analyzed theoretically.
这两种击穿过程均产生较强的辐射，且辐射频谱特征十分相似，表明云内闪电通道两端发生的击穿过程可能均为负击穿过程。
Radiation field spectra of the two concurrent breakdown processes are quite similar, indicating that the processes may be negative breakdown and may be caused by the same mechanisms.
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